noun ·Uncommon ·Advanced level

Definitions

Noun

1. 1
   Treachery; the characteristic of being treacherous. uncountable

   "He had an aggressive treacherousness of eye which his potations had not subdued."

2. 2
   The characteristic of providing insecure footing or support; of being marked by hidden dangers, hazards, or perils. wordnet

Synonyms

All synonyms

apostasyartfulnessbetrayalbreach of promisebreach of trustconspiracy

Example

More examples

"He had an aggressive treacherousness of eye which his potations had not subdued."

Etymology

From treacherous + -ness.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.